Backport https://github.com/google/pywrapcc/pull/30094/files#diff-9973fac8af12c04b84a77049b3bd0be619441caac64ec75658d3939add4f0e00

Author: rwgk

tests/test_methods_and_attributes.py

@@ -1,3 +1,4 @@
+import abc
 import sys
 
 import pytest
@@ -227,6 +228,22 @@ def test_metaclass_override():
     assert isinstance(m.MetaclassOverride.__dict__["readonly"], int)
 
 
+def test_abc_meta_incompatibility():  # Mostly to clearly expose the behavior.
+    with pytest.raises(TypeError) as exc_info:
+
+        class ExampleMandAABC(m.ExampleMandA, metaclass=abc.ABCMeta):
+            pass
+
+    assert "metaclass conflict" in str(exc_info.value)
+
+
+def test_abc_meta_compatibility():
+    class MetaclassOverrideABC(m.MetaclassOverride, metaclass=abc.ABCMeta):
+        pass
+
+    assert type(MetaclassOverrideABC).__name__ == "ABCMeta"
+
+
 def test_no_mixed_overloads():
     from pybind11_tests import detailed_error_messages_enabled